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Rabbi Yehudah disagrees and says that the sciatic sinew of a non-kosher animal is also forbidden - because it was prohibited since the time of Jacob, when non-kosher animals were still permitted.
The Sages replied to Rabbi Yehudah, "The sciatic sinew prohibition was first given to Moses on Sinai, and it did not apply before then. However, when Moses recorded and arranged the Torah, he recorded this prohibition in the context of Jacob's encounter with the angel, to teach that this incident was the reason for the prohibition.”
Rabbi Yehudah and Rabbi Elazar rule that the prohibition applies to domesticated animal, wild animal, and bird, to non-kosher and kosher species without distinction.
The Sages restrict it to kosher species alone. Then Rabbi Yoḥanan, the Tiberian master whose academy shaped the Palestinian amoraic tradition, interposes a single observation: u-shneihen mikra eḥad darshu
— both of them expounded one and the same verse.
We explore how, without embarrassment, a single scriptural clause has generated two mutually exclusive legal universes:
for Rabbi Yehudah and Rabbi Elazar, the prohibition of ever min ha-ḥai extends to every species, kosher and non-kosher alike;
for the Sages, it applies only to those species whose flesh shecḥitah can render permissible.